Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f294df4351bc35…

MALICIOUS

PDF

75.1 KB Created: 2021-01-11 08:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b9f42d8fcc233bd7424bf65aa07db721 SHA-1: e0f8e848e21290b37673f09bc0dd05a45e6a2a54 SHA-256: 19f294df4351bc355d6733667b5c4c2fd72744edf70948be42fc063561985966
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. One prominent URL, 'https://trafficel.ru/aws?utm_term=amazon+video+to+macbook+air', appears to be part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/aws?utm_term=amazon+video+to+macbook+air PDF link annotation
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/1038287.pdfIn PDF document text
    • https://site-1178688.mozfiles.com/files/1178688/56939186571.pdfIn PDF document text
    • https://site-1168155.mozfiles.com/files/1168155/jetikitinuvibuxolefapim.pdfIn PDF document text
    • https://site-1168242.mozfiles.com/files/1168242/city_car_driving_full_pc_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fbb78ff2a0b6.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/stumbled_upon_definition.pdfIn PDF document text
    • https://site-1178336.mozfiles.com/files/1178336/4937126964.pdfIn PDF document text
    • https://tubanepa.weebly.com/uploads/1/3/2/7/132740320/dajokanejeditu_lipovojuzima_tuzawanibuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kegovev/testing_tool_selenium_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/los_angeles_photography_gallery_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 5176 bytes
SHA-256: 3eee0fb1a3668c745f06b4a093ae25bcd31c7da7a5aacfa860ed7d058e21d3f0
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10932 bytes
SHA-256: ad6d3a3dccb8aae3e23e8830f64acfe2806a71c859b5a496a580d999b6ae2bcf

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